body{
    padding: 10px;
}
th{
    text-align: center
}
td{
    text-align: center
}
.wraper{
    float: left;
    position: relative;
    left: 50%;
    clear: both;
}
.chlid{
    position: relative;
    left: -50%;
}

.mask{
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.23);
    z-index: 1000;
    display: none;
    margin: 0;
}
.mask_tip{
    font-family: 楷体;
    position: fixed;
    top: 12%;
    left: 28%;
    color:black;
    font-weight:500;
}
.mask_content{
    position: absolute;
    width: 76%;
    height: 45%;
    background-color: #FFFFFF;
    border-radius: 10px;
    top: 112px;
    left: 12%;
    padding: 10px;
}
.for_select{
    display: none;
}

#select:checked+.mask{
    display: block;
}
#select1:focus +#select+.mask{
    display: block;
}

#select2:checked+.mask{
    display: block;
}
#select3:focus +#select+.mask{
    display: block;
}